Geoid 1995

© GFZ

Image 3: The irregular gravitational field of the Earth in highly exaggerated representation.
Become known as the "Potsdam Gravity potato".
37 satellites launched since 1960 (including ERS-1 and LAGEOS), measured by Satellite Laser Ranging (SLR) and other older methods of measurement,
plus surface data (airborne gravimetry and satellite altimetry)